export interface Codec {
    /** Decode raw bytes in the given encoding to a JS string. */
    decode(bytes: Uint8Array, encoding: string): string;
    /** Encode a JS string to raw bytes in the given encoding. */
    encode(text: string, encoding: string): Uint8Array;
}
/** Normalize an iconv-style encoding name to a WHATWG TextDecoder label. */
export declare function normalizeEncoding(name: string | null | undefined): string;
export declare class DefaultCodec implements Codec {
    private decoders;
    private encoders;
    private utf8Encoder;
    private decoderFor;
    decode(bytes: Uint8Array, encoding: string): string;
    /** Build a reverse map (codepoint -> byte) for a single-byte encoding. */
    private reverseTable;
    encode(text: string, encoding: string): Uint8Array;
}
export declare const defaultCodec: Codec;
/**
 * Port of readstat_convert(): strip trailing spaces and NULs, then decode.
 * `maxLen` (dst_len - 1 in C) bounds the *decoded* result is not enforced here
 * because JS strings are not fixed-width; callers that need the C length checks
 * use the raw byte length instead.
 */
export declare function convertString(codec: Codec, src: Uint8Array, encoding: string, offset?: number, len?: number): string;